Aug 19, 2010 8:57 PM by Stefanie Boe
Some of the top runners from around the world are here in Colorado Springs for the 55th Annual Pikes Peak Ascent and Marathon.
Runners will run up the mountain starting Saturday at 7 a.m. in the Ascent. On Sunday, runners will go up and back down. That race also starts at 7 a.m. During the race, runners gain about 7,800 feet in elevation. That makes it one of the toughest and most dangerous races in the world. It's also very hard to train for.
Click here for more information on the races.